M15 = NGC7078 ( 21h 30.0m +12°10´, 6.4 mag.)
This rich and compact globular cluster in Pegasus was discovered by Maraldi in September 1746 and Messier observed it on June 3, 1764. M15 is about 30,600 ly away and has diameter of 130 ly. It also contains planetary nebula K648 (13.8 mag.). M22 is the only other globular containing such object. M15 may also contain a central "black hole" - that would explain X-ray source at its center.
Binoculars will reveal M15 about 4°10' NW of e Pegasi (see finder chart below).
The above image was taken on July 14, 2002 from Harrowsmith, Ontario. Cookbook 245 LDC CCD camera was used on Ultima 8 f6.3 telescope autoguided with Cookbook 211 LDC CCD camera on piggybacked 500mm f8 telephoto lens. Ten white exposures (120 sec. each) as well as cyan, magenta and yellow-filtered integrations (5 x 120 sec. each) were combined with AIP4WIN and color was adjusted in Lab color space using Corel PhotoPaint 8.
North is to the right.
Map created in Guide 7.0 - 7°45' x 12°. North is up.
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© Jan Wisniewski